Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2007-07-03
2007-07-03
Chang, Daniel (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S083000
Reexamination Certificate
active
10798597
ABSTRACT:
Techniques are provided for matching the characteristic impedance of different transmission lines coupled to I/O pins on an integrated circuit. On-chip termination impedance circuitry can generate different termination impedance values for each I/O pin. Each termination impedance value is selected to match the characteristic impedance of the transmission line coupled to a particular I/O pin. The termination impedance can be set in response to the value of an off-chip resistor. Bit shifter circuitry can change the termination impedance provided to individual I/O pins. The bit shifter circuitry can increase or decrease the termination impedance at any of the I/O pins without changing the value of the off-chip resistor.
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Sung Chiakang
Wang Xiaobao
Altera Corporation
Chang Daniel
Townsend and Townsend / and Crew LLP
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